Utjecaj temperature i vremena boriranja čelika X90CrMoV18 na debljinu i tvrdoću boridnog sloja

undergraduate thesis

• Title (english): Effect of temperature and time of boriding of steel X90CrMoV18 on the thickness and hardness of the boride layer
• Author: Leonard Petrlić
• Mentor: Darko Landek (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U teoretskom dijelu rada opisan je postupak boriranja u prašku te karakteristike i rast boridnih slojeva. Objašnjeno je što sve utječe na mikrostrukturu, debljinu i svojstva boridnih slojeva. Definirani su martenzitni nehrđajući čelici te su navedena svojstva, primjena i toplinska obrada martenzitnog nehrđajućeg čelika X90CrMoV18.
U eksperimentalnom dijelu rada opisan je postupak pripreme i izvođenja boriranja čelika X90CrMoV18. Poslije boriranja uzorci su metalografski pripremljeni u svrhu određivanja debljine, mikrostrukture i mikrotvrdoće boridnog sloja. Upotrebom regresijske analize postavljen je matematički model za predviđanje brzine rasta boridnog sloja ovisne o temperaturi i vremenu boriranja. Provedena su tri naknadna boriranja i ispitivanje debljine boridnog sloja za validaciju matematičkog modela. Postavljeni matematički model predvidio je eksperimentalno određene debljine boridnog sloja s relativnom pogreškom manjom od 7 %.

Abstract (english)

In the theoretical section of the work, the proces of powder boriding and the characteristics of boride layers in terms of morphology and growth are described. The factors influencing the microstructure, thickness and properties of boride layers are thoroughly examined. The concept of martensitic stainless steels is explicated, and the properties, applications and heat treatment of the X90CrMoV18 martensitic stainless steel are also presented.
In the experimental section, the procedures for preparing and executing the boriding of X90CrMoV18 steel are outlined. The samples were then subjected to metallographic preparation to assess the thickness, microstructure and microhardness of the boride layer. By utilizing regression analysis, a mathematical model was established to predict the rate of growth of the boride layer as a function of temperature and boriding duration. Three additional boronizing treatments were performed and the thickness of the boride layer was measured to validate the mathematical model. The mathematical model predicted the experimentally determined thickness of the boride layer with a relative error of less than 7%.

• Keywords: boriranje; martenzitni nehrđajući čelik; kinetika boriranja; boridni sloj
• Keywords (english): boriding; martensitic stainless steel; boriding kinetics; boride layer
• Language: croatian
• URN:NBN: urn:nbn:hr:235:319356
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Materials Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-25 15:38:48